11972971 has 2 divisors, whose sum is σ = 11972972. Its totient is φ = 11972970.

The previous prime is 11972959. The next prime is 11972993. The reversal of 11972971 is 17927911.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11972971 - 2⁹ = 11972459 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11972971.

It is not a weakly prime, because it can be changed into another prime (11972171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5986485 + 5986486.

It is an arithmetic number, because the mean of its divisors is an integer number (5986486).

Almost surely, 2^11972971 is an apocalyptic number.

11972971 is a deficient number, since it is larger than the sum of its proper divisors (1).

11972971 is an equidigital number, since it uses as much as digits as its factorization.

11972971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7938, while the sum is 37.

The square root of 11972971 is about 3460.1981157153. The cubic root of 11972971 is about 228.7708277292.

The spelling of 11972971 in words is "eleven million, nine hundred seventy-two thousand, nine hundred seventy-one".